Rod-gripping device



(No Model.) 2 Sheets-Sheet 2. G. M. OONRADSON.

RODGRIPPING DEVICE. r No. 489,936. Patented Jan. 17, 1893.

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Unrrnn STATES- PATENT UFFIQE,

CONRAD M. CONRADSON, OF MADISON, WISCONSIN.

ROD-GRIPPING DEVICE.

SPECIFICATION forming part of Letters Patent No. 489,936, dated J anuary17, 1893.

Application filed July 12, 1892- Serial lie-439,801- (No model.)

To aZZ whom it may concern:

Be it known that I, CONRAD M. CONRADSON, a citizen of the United States,residing at Madison, in the county of Dane and State of W'iscousin, haveinvented certain new and useful Improvements in Rod-Gripping Devices, ofwhich the following is a specification.

My invention relates to rod gripping devices for screw making andanalogous machines, and has reference more particularly to that class ofdevices represented in Letters Patent No. 477,513, issued to me June 21,

The present invention comprises the combination with the stock or bodyof radially moving jaws, a sliding collar for actuating the jaws, one ormore levers pivoted in the stock and serving to actuate the collar, anda sliding ring, which in turn serves to actuate the lever or levers.

The invention further comprises certain other features, details andcombinations hereinafter shown, described and claimed.

In the drawings,-Figure 1 is a vertical longitudinal sectional view ofmy chuck or rod gripping device applied to the turret of a lathe; Fig.2, a front face view of the same; and Figs. 3 and 4t, longitudinalsectional views showing modified arrangements of the levers andattendant parts.

A indicates the turret, tool post, or other moving part of the lathe,which is designed to be moved toward and from the face of the chucksecured upon the hollow arbor, as is customary in this class of machinesand as shown in my patent No. 477,513, above referred to. Secured to anopening in the turret, in line with the hollow arbor, is a stud shaft Bwhich, while capable of a slight longitudinal movement, is held againstrotation relatively to the turret by means of the screw bolt 0, asclearly shown in Fig. 1. Mounted upon the shaft B so as to turn orrotate thereon, but not to move lengthwise thereof, is the stock, body,or shell D which is provided at its forward end with radial seats orgrooves to receive the sliding jaws E, whose outer ends are beveled orinclined as shown in Fig. 1.

F indicates a collar which encircles the outer end of the stock or bodyB, and projects over the outer ends of the radial jaws, said collarbeing adapted to slide lengthwise of the body, and in thus moving orsliding actuate the radial jaws, as will be clearly understood uponreference to Fig. 1.

J onrnaled or pivoted in the stock or body D is a lever G,-one ormore,which1 has a nose (0 which is designed to project upward behind therear face of the sliding collar F and prevent said collar from movingrearwardly relatively to the body or stock of the chuck. The lever G isfurther provided with a heel or projection 17, which is designed to bestruck or engaged by a sliding ring H which encircles the stock or bodyD in rear of the sliding ring F, as shown in Fig. 1. This ring isgrooved circumferentially as at c to receive the inwardly projectinglugs or pins d carried at thelower ends of the forked lever I, whichlatter is in turn pivoted in ahracket J secured to the turret. Byrocking the lever I, the ring II will be moved backward and forwardlengthwise of the stock or body D. When the ring is moved forward itbears upon the upwardly projecting nose of the lever G, thereby lockingthe leveragainst movement, it being understood of course that when thelever is locked in the position shown in Fig. 1, rearward movement ofthe collar will also be prevented. \(Vhen the ring H is moved in theopposite direction or rearwardly, it strikes the tail or lug of thelever G, rocks the lever upon its pivot, and throws its nose or up outof the way so as to permit the sliding collar F to be retracted byreason of the ring striking against the head of a bolt K secured to thecollar and passing through the ring, as clearly shown in Fig.1. Ofcourse as soon as the ring strikes the head of the bolt K, the slidingcollar F will be moved backward so as to allow the jaws to release theirhold upon the rod or stock to be grasped.

In Fig. 2, I have shown in dotted lines only two levers G, but I do notwish to be restricted to this or any special number. It will be foundadvisable in all cases, however, to employ at least two levers, asotherwise there would be a tendency of the collar to bind upon the stockor body D.

In order to adapt the device to the various inequalities in the rod orbody to be grasped,

it will be found advisable to provide a yielding contact between thecollar F and the lever G, as shown in Fig. 1, such yielding contactcomprising merely abolt L seated in a socket M formed in the collar andencircled by a coiled spring N which bears at one end against the headof the bolt and at the opposite end against the base of the socket. Fromthis construction it will be seen that as the lever G is pressed againstthe head of the bolt L by means of the ring H, the contact or connectionbetween the lever and the collar will yield slightly and relieve theparts of the strain to which they would be subjected were there noyielding contact.

In the construction shown in Fig. 3 the lever G is made in the form of atriangular block seated or journaled at the apex in the stock or body G.Under this arrangement the lever does not make contact with the collarF, as in the previous arrangement, but is pivoted in a ring 0 in suchmanner that when the sliding ring H is moved so as to tip or rock thelever, the sliding ring or block 0 in which said lever is pivoted iscaused to act upon the collar, or more properly speaking, upon the headof the bolt L. The action of the two devices is the same.

In the construction shown in Fig. 4, I employ a curved lever G, andpivot said lever directly in the stock or body D as in the arrangementshown in Fig. 1, and in order to retract the sliding collar Fpositively, I connect the said lever G" with the bolt L by means of alink P, thus forming a toggle connection between the lever and thecollar and dispensing with the use of the long separate bolts K whichare employed in the constructions shown in Figs. 1 and 3.

The yielding contact or connection between the sliding collar thatactuates the jaws and the lever or levers that actuate the collar, maybe omitted if desired, and the levers arranged to bear directly againstthe rear face of the collar.

Having thus described my invention, what I claim is:

1. In a rod gripping device or chuck, the combination with the stock orbody, of radially-moving jaws, a sliding collar for actuating thelatter, levers having a yielding contact or connection with the collar,and a sliding ring for actuating the levers.

2. In combination with support A shaft B and shell or body D, the radialjaws E, the sliding collar F beveled to conform to the beveled ends ofthe jaws, levers G mounted in the shell or body to force the collar Foutward, a ring for actuating the levers, and a bolt K secured to thecollar and provided with a head to be struck by the ring.

3. In combination with support A, shaft B and shell D, the radial jaws,the sliding collar F provided with sockets M, bolts L and springs N, thelevers G pivoted to the shell or body and adapted to bear upon thebolts, and the sliding ring for actuating the levers.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

CONRAD M. CONRADSON.

Witnesses:

W. R. BAGLEY, J. I. RUDD.

